mail problems: receive but cannot send

I am running suse 10.0 and everthing has been running fine until I noticed that that I could no longer redirect emails to my mobile, after checking my mail server I found that iI could receive emails but couldn`t send them.
I know that some dynamic IP`s can cause a problem so i rebooted my router box to obtain a different Ip, which after a few attempts my dynamic IP was changed from 88.105.6.209 to 88.105.127.86

Thanks falko,
After seaching the net i found that my ISP (tiscali) was the main cause of the
problem and they are still having many issues with their amil servers.
If iwas to change ISP`s would i just overight the previous script? here www.howtoforge.com/postfix_relaying_through_another_mailserver
If anyone is interested I found a great ISP that offers a home package from £9.49 per month including a static IP . Also business broadband from £25 per month including up to 8 static IP`s.
If it`s ok with falko and till i will post the link here.

Yes, you have to modify /etc/postfix/main.cf if the mailserver changes.

shajazzi said:

If anyone is interested I found a great ISP that offers a home package from £9.49 per month including a static IP . Also business broadband from £25 per month including up to 8 static IP`s.
If it`s ok with falko and till i will post the link here.

I have found that Newnet can offer home broadband from as little as £9.95 including 1 static ip with the option of buying up to eight additional IP`s for a very small fee. Also business broadband from £25 plus vat
Up to 8Mb download speed and up to 448kbps upload speed and this is the important bit no packet shaping. http://www.newnet.co.uk/
Also this can be done on a monthly basis so that you are no tied up for 12 months. So if you are not happy after a month then you can simply leave.

With all the recent security issues and empty promises from Tiscali i thought it was time for a change